I made the change from three to four screws, but you're able to edit the guides as well. If you want to edit something, you can click the Edit link on the right side of any guide step, or the Edit link at the top right of the page (sandwiched in-between View and History).

It seems these can be quite tight, but they did come loose with someextra force in my case. They did that thing where it makes cracking sounds, but nothing really breaks. They're just really tight in there. - I just wouldn't recommend taking these out too often.

It seems it kind of ends for me here. I can only lift the left side about an inch and then the right side stays down like it’s stuck to something underneath. It feels like I’m bending something. Could something have melted underneath?… It's really stuck, I can't get it to come loose. And I can't see much shining a light into it either. - Any tips?…

I had the same issue but was able to get it off. The right side (as per the above picture) has two long column like sections that actually goes into the machine. Took me a bit of wiggling and some brute force.